Spent this afternoon on the boat trying to work out a few things and have made some headway with the help of Raymarine tech support.
1 - As to the vane reading backwards, if you read the installation manual VERY carefully you will see it tells you to have the vane point towards the bow. Very non-intuitive. Mine points asswards as you would expect. Raymarine had me "calibrate" the instrument 180 degrees. If it alludes to this in the manuals I have not found it.
2 - I traced out the "double" wiring
to the instruments. It appears that the previous owner had wired the transducers to the nav table instruments thus making them the "masters" and then extended this same wiring
to the cockpit
in the event he changed his mind. The wires were not connected in the cockpit
but left unterminated and taped. They are now cut off. @#$%^&
3 - The C80 did not show anything in the "speed" box which I had assumed to be an input from the GPS. Apparently not. According to tech support "Speed" comes from the paddle wheel
or something else while SOG (Speed Over Ground) comes from the GPS. SOG shows in the defalut windows as I found out when I reset the factory defaults. Why the previous owner had removed the SOG and replaced it with a non-functioning data box is anyone's guess, though I have my suspicions. To be fair I had looked for explanations of these data boxes and did not find them in the manuals while the tech clearly knew the difference.
4 - The speed instrument off the paddle wheel
is still not working properly. I am trying to change out the tri-data instrument with the cockpit speed instrument to see if that will change the indications. I'll dope that out tomorrow as we get 2 - 3 knots of current
in my berth but was a slack water
when I decided to bag it for the day today.
Many thanks for all the help.